Heihe, in China's Heilongjiang province, bordering Russia, was part of a Japanese puppet state known as Manchukuo in the area of Manchuria at that time.
黑河位于中国黑龙江省，与俄罗斯接壤，当时是日本伪满洲国的一部分。
Japan invaded Manchuria in 1931.
日本在1931年入侵了中国东北。
On old maps, the land is called Outer Manchuria or, even more evocatively, Eastern Tartary.
